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TY - CONF AU - Su, X.L. AU - Du, Y.-C. AU - Huang, W.-H. AU - Liang, Y.F. AU - Niu, L. AU - Tang, C.-X. AU - Tian, Q.L. AU - Wang, D. AU - Yan, L.X. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Measurement of Electron Bunch Length via a Tunable-Gap Undulator J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - A THz undulator with widely tunable gap is constructed and installed at Tsinghua University beamline, which is applied for narrow-band THz radiation and measurements of electron bunch longitudinal structure. This is a planar electromagnetic device with 8 regular periods, each 10 cm long. The field range B=0.15- 0.99 T peak field on axis while changing the gap from 75mm to 23mm. In the experiments, we scanned the undulator gap to measure the radiation intensity at different resonant frequency, thus we can get the bunch length even form factor of the bunch. The demonstrated experimental results show that the bunch of 220pC compressed by chicane in Tsinghua beamline is about 120fs (rms), which agree well with the simulations. The resolution of bunch length measurement with this method can be attoseconds by optimized undulator. Furthermore, the form factor of electron bunch train can also be measured. PB - JACoW CP - Geneva, Switzerland SP - 295 EP - 297 KW - radiation KW - electron KW - undulator KW - laser KW - acceleration DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-MOPAB075 UR - http://jacow.org/ipac2017/papers/mopab075.pdf ER -